Cosmology: small scale issues

Details Cosmology: small scale issues Cosmology: small scale issues

2009-02-15

arxiv.org/abs/0902.2506v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

7 pages, 1 figure, to appear in the proceedings of the 8th UCLA Dark Matter Symposium, Marina del Rey, USA, 20-22 February 200

Scientific paper

The abundance of dark matter satellites and subhalos, the existence of density cusps at the centers of dark matter halos, and problems producing realistic disk galaxies in simulations are issues that have raised concerns about the viability of the standard cold dark matter (LambdaCDM) scenario for galaxy formation. This talk reviews these issues, and considers the implications for cold vs. various varieties of warm dark matter (WDM). The current evidence appears to be consistent with standard LambdaCDM, although improving data may point toward a rather tepid version of LambdaWDM - tepid since the dark matter cannot be very warm without violating observational constraints.

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